The Waterproof Case Weight WW-DC1 is used in Canon Waterproof Cases to prevent them from floating while taking pictures underwater. Four pieces of weights, plastic pins and weight securing screws are included in the WW-DC1 package. In using this weight, put two suitable pins into the shown number of weights and fasten it to the waterproof case with the securing screw. In the case that the other accessories are attached to the waterproof case, the number of weights may vary.